Improvement in drop-presses



A D'. These pulleys are provided with toothed engage with each other, and arethereby driven to the arm vF', which is keyed to the bearing I to that vwhere the rod G is placed there is a FRANK CHENEY,

IMPROVEMENT iN onor-PRESSES.

. Specification forming 1'- art of Letters Patent No.. 36,459, dat-ed Septtmbcr'l, 1862.

ZaaJl whom/itmay concern: v u

Beit known that we, FRANK CHENEY, of Hartford, in theState of Connecticut, and WIL-v LIAM. F. GoULDNIG,'-ofthe 'city and county of- Providence, in the State of -Rhodelsland, have invented a new and 'useful Improvement in Drop-Presses; andwe dohereby declare that the following specification, taken in connec-` tion with the drawings making a part of the same,is a full, clear, and` exact description thereof.

Figure 1 is a 'front view. Fig. 2 is a side View. Figs. A3 and 4c are-detailed parts to be referred to hereinafter.

In the accompanying drawings, the drop weight or'hammerA is fitted to work in guides on a gallowsx-frame, B B. It is raised by means of a straight strap, C, of leather, sheet metabor other material possessing the requisite friction-surface to enable thelifting-pulley to act.k This strap, which may be of any desired thickness and should possess no elasticity,'passes between the faces of the two pulley-wheels D' gears, which are of the same sizeV and fitted to in opposite directionsby the belt,which passes over the driving-pulley E, attached to the shaft to which pulley D is secured. The pulley D revolves upon a shaft,which, with reference to 'the bearing F, is set eccen trically, so that by raising the rod G, hingedl F, the pulley D will be moved away from the liftingstrap, against which at other times it presses. The rod G extends downward to near the foot of the frame andisprovided with two adjustable sliding blocks, a b, the purpose of. which will presently be understood.

Upon the side of the gallowsframe opposite similar. rod, H, which is capable of turning axially in suitable bearings. It is provided with an adjustable block, c, and also with a coiled spring, d, the latter being for the purpose of retaining the rod, with its attachments, iu the proper relative position. j

Projecting from each side of the dropweight l are the wedge-formed ears eand f, the office of which is to operate the adjustable stops ab c,

. abovereferred to. Suppose, now, the pulley- E to be revolving, the operation of the drop Awill be as follows: Bythefriction of the drums' D and D upon the strap C thevweight A 1s carried upward until it reaches the point where the stop c is placed. lThe inclined face of f strikes against a corresponding inclination on the lower face, of the stop c, whereby the rod H is turned in its bearings far enough to permit the earito pass. The coiled spring d in st-antly returns the rod to itsformer position,

so that the hammer upon its return will be sustained by tlie base of the wedge f resting on the upper surface of the' [stop c. `The care' on theop'posite side sh onld strike against the stop a as soon as the `projecting ear f ,has fairly f passed the stopc and raise the rod G high enough yt'o actupon the arm F', and thereby move the drum D so far from thedrum Das to destroy the friction upon the strap C. The weight A will then descend-untilitis arrested, as before stated, by the stop c.y

When it is desired'to trip the weight, the l operator depresses with his foot the treadle-T; which, through the chain J and lever K, operates the rod lH and removes the support tothe weight.

.In order to keepthedrum D from pressing against thelifting-strap until after the hammer has given its blow, and also to insure the ascent of the hammer the in stant 'that theblow yhas been struck, the following varrangement has been employed: When the rod G is raised the anvil,the projecting ear e, having its inlelinedl face turned downward, comes in contact ,with the inclined face-of the stopbandpushes the foot of the rodf'G from its supportf ing= shelf. y The drum D is then brought again to act on the strap C, and the hammerI is at.l

once raised to its former elevation.

Y Inasmuch as the strap C would, if v.there crosshead of the gallows-frame.

y of friction which this block should exert' in z order tokeep the strap at all times from belly-` 4 were no meanstakenfto prevent it, be liable to hang slack when the` hammer was down, and

f 'thnsincrease the probability that thehammer' would reboundupon the work, afrctionblock, l, Fig. 3, is placed against the strap 0,'over the The degree ing is regulated by the belli-.crank lever m,

upon-.the long arilnof whichV is'the weight n, by-which the degree of pressure c'anbe easily regulated.

-It win befo'bservefi that the improvements described secure the' following advantages,

which'render this machine sliperorto all? others of its class heretofore known. `*The .straight strap admits ot' any degree of strength which may be reqnired,rfrom the fact that a.

' j number o'f thick nessesoisole-leather,or strips of leather and sheet metal'combined.'maybe' used for the strap when made in this form,'

while it wouldbe impossible 'to 'use the same thickness of leather or the same combina- Vtion of' materialsV inthe'form of Va-loeltV tobe wic'und 'around nqnilley'4 rThe t'rlctionblock'1,l with its controlling'flever m, is a cheap and eiectual means for preventingr the strap frornbecoming 1s lack while the adjustable blocksa' f "b cadmit of the ready adjustment of the height from which thehamrner is to fall' atthe same y 'timeithat they'insn're a freeglescent tothe hammercin falling, and an immediatel ascent toV e its proper; elevation the instant thatthc blow i has been struck. ,j In the majority of the-kinds otmwork'for which these presses are `employed it is desired "that-when the treadle N is depressedthe short arm of thelever will raise the rod G and'perthe supportingstop `c) from the elevation at whichit'happensto he.v 1

to secnreby Letters Patent, is

scribed,.'for the purposes specified'.

3- 2. The'coinbinationoffa fri tiontiallyasdescribed. L v A 3; The combination ofthe adjustable sup-` 4portingstop b and thehammerAg tiallyasdescribed.;

'4. The combinationand arrange e'xitioffthe4 and. b," when' the latterare combined witheach stantialiy-as described. FRANKCHENEQ -iliitnesseszt Y JOHN H. VftI-JLIS', l

CLAREN-E (Failures.v

to have'the'ha'inme'r fall from Aa vfixed point.

In some instances, howevcr,i t mayaiie'advaig- 'tageous to give a succession of blows'of. varyl is4 exhib. ted 'i-'n Fig. 1'-,`.consisting"of aflever, L,:pv0t ed to the'fulcrlim-standard Mf,` aud so arranged` mit the hammer to fall (unless it' haspassed What we cl'aru'as our invention, anddesire v 1 Thecombination of a-Strajp, G, either ilexibleor therwise,(as. distinguished fronte belt,`) or.- its equivalent, in combinatiouwith La pairr "of friction-pulleys, D'` D', substantiallyas-de'- with `'the' y strap O, o`r its equivalen@ jsubstan4 suhstani hammer'A., with both the adjustablA` stops a' other to arrest the further ascent of tleharnj .merand to sustain it at' any given point5-s`iib t WM. FxGOULDING; 

